Karsten Eller, Erhard Henkes, Roland Rossbacher, Hartmut Höke "Amines, Aliphatic" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH Verlag, Weinheim. doi:10.1002/14356007.a02_001
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A. Butlerow (1859) "Ueber einige Derivate des Jodmethylens" (On some derivatives of methylene iodide), Annalen der Chemie und Pharmacie, vol. 111, pages 242–252. In this paper, Butlerov discovered formaldehyde, which he called "Dioxymethylen" (methylene dioxide) [page 247] because his empirical formula for it was incorrect (C4H4O4). On pages 249–250, he describes treating formaldehyde with ammonia gas, creating hexamine.
See also: A. Butlerow (1860) "Ueber ein neues Methylenderivat" (On a new methylene derivative), Annalen der Chemie und Pharmacie, vol. 115, no. 3, pages 322–327.
